※ [本文转录自 NTU-Exam 看板] 作者: bearluck (没有昵称就是昵称) 看板: NTU-Exam 标题: [试题] 93下 普化丙 简淑华 时间: Tue Jun 21 21:02:31 2005 课程名称︰普通化学丙 课程性质︰ 课程教师︰简淑华 开课系所︰化学系 考试时间︰2005.06.21 试题 : 1.Briefly explain or distinguish the following terms: (1)degenerate orbitals (2)isoelectronic ions (3)aromatic and aliphatic compounds (4)acidic,basic,and amphoteric oxides (5)valence electrons and core electrons (6)the Heisenberg Uncertainly Princple and Pauli Exclusion Principle 2.Arrange in order of decreasing the specified properties: (1)polarity: H-Cl ,Cl-Br,Cl-Cl (2)first ionization energy:Li,Be,B (3)atomic radius:K,Ca,S,Cl (4)ionic radius:K+,Ca2=,S2-,Cl- (5)wavelegth:IR,UV,microwave (6)frequency of light:red,yellow,blue (7)bond angle:CH4,NH3,H2O (8)electronegativity:N,As,P,F (9)acid strength:HClO,HClO2,HClO3,HClO4 (10)solubility in water:NaCl,AgCl,AgBr,AgI 3.What is VSEPR method?Use the method to predict the following molecular geometry: (a)PF3 (b)XeF4 (c)ClO4 (d)SF5- 4.(a)Write a structural and the condensed tructural formulas for acetic acid and use the Valence Bond Theory to describe the bonding in the molecule;(b)Predict the bond angles about each of the two carbon atoms(c)Draw a likely structure of dimer of acetic acid by using intermolecular H-bondings. 5.Two ions of O2 are commonly encountered in the oxide of the Group 1A metals:peroxide ion,O22-,and superoxide ion,O2-.Use molecular orbital theory to constuct the molecular orbital energy-level diagram for O2 molecule and write teir electron configuration for the two ions. Then,compare the ions with respect to bond order,bond length,bond energy and magnetic properties. 6.(1)Given the standard reduction potentials at 25 *C for Cu2+/Cu and Ag+/Ag(s) are 0.340V and 0.800V respectively, write the half reactions for the electrode reactions and the overall chemical reaction for the cell: Cu(s)|Cu2+(aq)||Ag+(aq)|Ag(s) (2)Calculate E*,G* and the equilibrium constant for the cell reaction. (3)Write the Nernst equation and calculate E for the following cell: Cu(s)|Cu2+(0.040M)||Ag+(0.002M)|Ag(s) 7.Answer the following questions by show calculations or give your reasoning: (1)The mass-to-charge ratio of the proton is found to be 1.044x10^(-8)kg/C What is its mass?Calculate the wavelength of a proton traveling at a speed of2.55x10^6 m/s (2)What are the frequency ,energy and color of light that has a wavelength of 650nm? (3)What are the n,l, and m1 quantum numbers corresponding to the 3s orbital? In what specific subshell will an electron having a quantum numbers n=3,l=2,and m1=1 be found? (4)Which group of elements has electron affinities with the largest negative values?Explain. (5)The experimental reslt shows the N2O molecule is linear and polar. Which arrangement,NNO or NON,is correct? Explain your answer. (6)A molecular having the formula C2H2Cl is found to be non-polar Write the sturctural formula of the molecule. (7)The first-orser rate constant for the gas-phase decomposition of N2O5 to NO2 and O2 at 70*C is 6.82x10^-3 s^-1 .If we start with 0.500 mole of N2O5 in a 500-mL container,how long will it take for the quantity of N2O5 to drop to 0.250 mole? (8)The rate of a process is found to be twice as fast at 300K as at 290K What is the activation energy of the process? (9)In the x-ray diffraction of a crystal,Cu Ka line with wavelength of 1.54A was used,a irst-order reflection was otained at an angle of 21.5*C; Write the Bragg Equation and use it to calculate the distance between the crystal planes(express in unit of A.nm and pm).Which electronic transition corresponds to the Cu Ka radiation and why UV light does not result in the appearence of a diffraction pattern? (10)At about 1000*C ,iron undergose a transition from the body-centered cubic structure to the face-centered cubic structure.The edge length of the unit cell increase from 286pm to 363pm.What are the number of atoms and mass of each unit cell? Compare the densities of these two forms of iron, and explain the difference.(Fe=55.8 amu) (11)Combustion of ethane will produce caron dioxide and water vapor,write the chemical equation and use the "bind energy" given below to estimate the enthalpy change for the above gas-phase reaction. D(C-H)=414; D(C-C)=347; D(O=O)=498; D(C=O)=736; D(O-H)=464 (all in kJ/mol) (12)6.62g of Pb(NO3)2 was added to a liter of 0.010M NaCl slution, will you see any precipitate? (Pb(NO3)2=331g/mol,ksp=2x10^-5 for PbCl2) 8.Give the [H3O+]and the pH of the following solutions: (a)2.0 M H2SO4 (b)0.0001M H2SO4 (c)0.5M HNO2(Ka=4.0x10^-4) (d)0.50M NaNO2 solution (e)a buffered solution conaining 0.50M HNO2 and 0.50M NaNO2 (f)adding 0.010 mole gaseous HCl to 1.0 L of the buffered solution in (e) --

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